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  3. What was the average age of the runners at the beginning of the survey? [origina

What was the average age of the runners at the beginning of the survey? [origina

游客2024-08-12  13
问题 What was the average age of the runners at the beginning of the survey?
A group of more than 300 runners over the age of 50 were tracked by Stanford University researchers starting in 1984. Their average age was 58 and most had been running for about 10 years. Now they are in their 70s and 80s. They were compared to a control group of non-runners.
选项 A、50
B、58
C、68
答案 B
解析 新闻中提到调查在1984年开始时他们的平均年龄是58岁。  
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